On Oct 3, 2007, at 3:44 PM, Dale Ghent wrote: > On Oct 3, 2007, at 5:21 PM, Richard Elling wrote: > >> Slightly off-topic, in looking at some field data this morning >> (looking >> for something completely unrelated) I notice that the use of directio >> on UFS is declining over time. I'm not sure what that means... >> hopefully >> not more performance escalations... > > Sounds like someone from ZFS team needs to get with someone from > Oracle/MySQL/Postgres and get the skinny on how the IO rubber->road > boundary should look, because it doesn't sound like there's a > definitive or at least a sure answer here.
I've done that already (Oracle, Postgres, JavaDB, etc.). Because the holy grail of "directI/O" is an overloaded term, we don't really know where the win within "directI/O" lies. In any event, it seems the only way to get a definitive answer here is to prototype a no caching property... eric _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
